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This article presents a simple, cognitive theory of science and learning. The first section of the paper develops the theory's two main propositions: (i) A wide range of scientific activities rely heavily on one type of reasoning, hypothetical thinking, and (ii) This type of reasoning is also useful to students for learning science content. The second section of the paper presents a taxonomy of multiple-choice questions that use hypothetical thinking and the third section of the paper tests the theory using data from a college biology course. As expected by the theory, student responses to 24 scientific reasoning questions were consistent with a one-dimensional psychometric construct. Student responses to the scientific reasoning questions explained 36% of the variance in exam grades. Several directions for additional research are identified, including studying the psychometric structure of scientific thinking in more detail, performing randomized, controlled experiments to demonstrate a causal relationship between scientific thinking and learning, and identifying the relative contribution of other factors to success in college.

Explored the relationship between high school students' (N=37) performances on the Tomlinson-Keasey and Campbell paper-and-pencil test of formal operations and a set of traditional, individually administered, Piagetian developmental tasks. Correlations between the traditional, formal operations tasks and paper-and-pencil tests were low. (Author/DS)

Tests and rejects the hypothesis that sensory motor curiosity declines from childhood to adolescence, by conducting a follow-up study of a group of pupils (N=32) whose curiosity behavior was filmed in 1970 when the age range was 6-12 years. Behavior is compared to that of a group in 1976. (CS)

Determined the degree to which classification of students (N=512) as formal or concrete based on three Inhelder tasks administered by clinical interview method was mirrored by Longeot and Karplus-Lawson-Renner (KLR) classifications. Results indicate that Longeot and KLR differentiate between concrete/formal operations and are discussed from perspective of practitioner and researcher. (Author/JN)

In this position paper, we introduce the concept of socioscientific capital (SSC) to denote students' resources that unequivocally play a part when students learn about and make decisions regarding socioscientific issues (SSIs). Students use a variety of resources when they engage with SSI. Our conceptualization of SSC expands on current conceptualizations to refer to resources related to both the scientific and the non-scientific aspects of SSI, including internal resources (personal experiences, values, attitudes, beliefs, knowledge, and skills), external resources (family, friends, communities, and media), and meta-level resources (dominant frames and cultures). Aiming to strengthen SSI education, we argue for taking into account how students' resources impact their SSI-related learning and decision-making. To this end, insight into students' SSC is needed and is imperative for teachers. By bringing together literature about SSI education and literature about students' resources, we provide a conceptual view on students' SSC and describe implications for SSI education.

New reforms in science education call for three-dimensional learning by integrating disciplinary core ideas, science and engineering practices, and "crosscutting concepts" (CCCs). These reforms defined the new term, crosscutting concept (CCC), as a lens that has explanatory power across disciplines. To describe how researchers are examining and using the CCCs related to science teaching and learning, a literature review was conducted to identify articles that included the term "crosscutting concept" since its introduction in 2012. The articles were narrowed to those that use the term CCC as a component of the framing, analysis, findings, or discussion of their empirical or nonempirical article. A subset of the identified papers elaborated on the CCCs beyond existing policy documents and references. These papers were open-coded to identify themes in how the CCCs were used. The identified themes suggest that the CCCs are useful for science teaching, learning, and research in terms of creating opportunities to learn, connecting to the big idea, linking to practice, drawing on funds of knowledge, and connecting across topics and disciplines. These themes were analyzed to identify areas of existing focus and those in need of additional research. This synthesis of the literature has implications for using and studying the CCCs within three-dimensional teaching and learning.

This paper shares the experiences, engagement, and struggle of one young Indigenous Hawaiian woman as she grapples with her sense of disconnect with STEM while serving as a land protector on the Mauna Kea, the home of the Thirty Meter Telescope being built over the objection of the local Indigenous community. I examine her changing perspectives and connections to STEM through her engagement during a summer school enrichment class focused on science and technology learning in service of community goals. Findings indicate that her sense of agency and autonomy were greatly improved by engaging in a space where science and technology were tools serving her goals of protecting the Mauna Kea from further development.

Understanding science allows students with and without developmental and behavioral-based (DB) disabilities to better appreciate the world around them as well as prepare them for the growing science-related job market. However, students in the United States consistently underperform on science achievement tests compared to students from other nations. This underperformance could be attributed, in part to science having many specialized vocabulary terms that are not often taught explicitly, leaving students with incomplete or inaccurate understandings of word meanings. Improving science vocabulary instructional practices may support students with and without DB disabilities in enhancing their science achievement. To address this need, researchers implemented multicomponent multimedia professional development (PD) to support middle-school science teachers in delivering high-quality vocabulary instruction in inclusive settings. In this paper, data collected from a study evaluating the efficacy of the PD were analyzed to determine the influence on student outcomes using ANOVA and multilevel modeling methodologies. Though initial results indicate a promising impact on teacher instructional practices, little is known whether teacher participation in the PD affected student science vocabulary and content knowledge growth. Using multilevel modeling, student science knowledge growth was evaluated following their teachers' exposure to the PD. The findings from this study indicate having indirect exposure to PD had a positive effect on science content knowledge for students with and without DB disabilities (N = 980). In addition, the authors found students with DB disabilities whose teachers had access to PD showed a larger gain in science knowledge than general education students whose teachers did not have access to the PD.

This position paper supports the exclusion of the special creation doctrine in science classrooms. Reviews the current controversy concerning legislative actions mandating the teaching of scientific creation in classrooms, presents creationists' and evolutionists' viewpoints, and discusses the philosophical disparity between creation and evolution. (CS)

The aim of this Special Issue of I JRST i is to provide a platform for thoughtful and critical examinations of translanguaging theory and pedagogy (García & Wei, 2014; Otheguy et al., 2015; Wei, 2018) in the context of science and engineering education. Call for papers: Journal of Research in Science Teaching - Special issue on "Examining translanguaging in science and engineering education research" This Special Issue serves as an opportunity to bring together science and engineering education scholars who are critically engaging with the questions of "what counts as productive means of communication?". [Extracted from the article]

Science, technology, engineering, and mathematics (STEM) identity has become a popular lens in science education research. However, few studies have looked at how using the interpersonal, structural, cultural, and disciplinary domains of power sheds light on how women of color differently navigate the various cultures of formal and informal schooling as well as college science and math departments. This paper uses narrative inquiry methodology to examine how a young Black woman constructs science and math identities through stories about her previous experiences becoming a science and math person. By also framing it within intersectionality and employing a storied-identity lens, this study provides insight into how stories that shape identities inform her science and math identities. Specifically, this study looked at how she navigated the emotions and social experiences that fostered an interwoven storied science, math, and racial identity across different times, spaces, and settings. It highlights how a strong sense of belonging in her science and math trajectories was positively influenced through various sources and moments of recognition from community influences (e.g., family, peers, and faculty) and structural disruptions (e.g., the HBCU she attended and STEM camp). Despite negative emotions of self-doubt and frustration were present when her science, math, racial, and smart student identities came into conflict, she leveraged the positive emotions of joy and pride in her interwoven science and math storylines, which strengthened not only her science and math identities but also her racial identity. The study underscores the importance of leveraging counter-narratives of resilience as a resilience strategy but also practicing acceptance and self-compassion when navigating tensions between racial, science, math, and smart-student identities for women of color in STEM. The study's conclusions add to the call for structural changes within K-12 and higher education that are crucial for equity goals within STEM education.

Science educators (N=28) were asked to indicate whether 23 policy statements and 24 corresponding statements of needed research (appearing in "Crisis in Science Education") represented a critical need, a definite need or a low priority need. Statements seen as critically important by one-half or more respondents are listed and discussed. (JN)

Examines status of quantitative treatment verification, presents arguments for its use, and describes a study examining differences between two laboratory approaches in high school biology. Suggests the ability to demonstrate quantitatively that specific classroom events contribute to measured changes in students productivity will aid researchers in arguments for causation. (Author/JN)

As distinct communities of practice (COP), science education research (SER) and environmental education research (EER) have both matured a great deal in recent decades, coming to include a greater diversity of theoretical perspectives, worldviews, and researcher and participant voices. In this paper, we present a view of theoretical inclusivity that promises a rich, robust research landscape for both EER and SER through the deliberate inclusion of non-Western theories. This view has several components: it requires researchers to be explicit and clear about their theoretical stances and to use critical reflection to evaluate their research; and it encourages the field to expansively explore phenomena and issues using multiple epistemologies and continue to deepen their focus on developing praxis. EER's interdisciplinary and cross-disciplinary nature make it uniquely positioned to model such inclusivity and move forward together with SER to create knowledge that is more robust and more just. We identify and discuss three key imperatives for the two fields to embrace this theoretical inclusivity now and the paths forward to support scholars doing work in both EER and SER and for the productive future of these fields.

Profound equity challenges persist in efforts to promote community engagement with science, with the intersecting effects of multiple pandemics - racial and economic injustice, COVID-19, and climate change, among others. Call for papers Journal of Research in Science Teaching Special Issue Community-driven science: Evidence of and implications for equity, justice, science learning, and participation While this is often termed "citizen science" or "community science", we see community-driven science specifically as work in which stakeholders are involved in the scientific process from early on as co-owners of a research agenda that is for the I wellbeing i of the community and its members. [Extracted from the article]

In this article, we explore how children of late elementary to middle school age, from low-income communities in an East-Central metropolitan area of Canada, described their interests in and attitudes toward science in an out-of-school science club program. We used the children's descriptions of emotional engagement to gain insights into the identity work being carried out in the science club. Our analysis was based on survey responses from 202 children enrolled for at least one academic year in the science club program at 21 different club sites and focus group commentary from a subset of 45 children attending 14 of the clubs. We added context to the children's perspectives by including commentary from semistructured interviews with nine science club staffers and insights from field notes made after club promotional events. Analysis revealed the enthusiasm of children and/or their families for science education prior to engaging with the clubs. The children's anticipation that club science would reflect their school-based science experiences was quickly dispelled by the hands-on nature of club activities and the positive relationships built with club staffers. Of concern was the finding that staff and children frequently reinforced a rigid dichotomy between school and club science. This distinction meant that, although children described themselves as improving their performance in school science, they often found it difficult to relate the fun enacted during club sessions to the learning that is required during school science classes. This finding is problematic given the club's focus on keeping children's options in formal and informal science education open for as long as possible. The paper concludes by using the insights provided by children and club staffers to propose ways of enhancing the club/school/home science connection to better support transfer of the positive outcomes of the club-based science identity work.

Scientific expertise and outcomes often give rise to controversy. An educational response that equips students to take part in socioscientific discussions is the teaching of Socially Acute Questions (SAQs). Students engaging with SAQs need to engage with socio scientific reasoning, which involves reasoning with evidence from a variety of fields other than science, including values, economics, local and global perspectives, governance issues, and a variety of stakeholder perspectives. This paper describes research in which tertiary students from France and Australia engaging with sustainability SAQs reasoned responses in wikis. In previous analyses (Authors, 2013), we have developed a six-dimensional framework of socio scientific sustainability reasoning (S3R). In this paper, we describe the development of an interactional reasoning framework that captures the quality of reasoning in the online discussions that led to specific improvement in S3R. The framework draws on and extends the discourse framework of Mercer, and Habermas' three worlds of validity of arguments to identify first that a particular category--integrated exploratory talk--is associated with improvement in S3R, and that this almost exclusively involves exchanges drawing on personal and social evidence claims as well as technical. We explore the implications for supporting collaborative decision making in socio scientific issues, for democratic participation and for post normal science education.

The Framework for K-12 science education (The "Framework") and Next Generation Science Standards (NGSS) emphasize the usefulness of learning progressions in helping align curriculum, instruction, and assessment to organize the learning process. The "Framework" defines three dimensions of science as the basis of theoretical learning progressions described in the document and used to develop NGSS. The three dimensions include disciplinary core ideas, scientific and engineering practices, and crosscutting concepts. The "Framework" defines three-dimensional learning (3D learning) as integrating scientific and engineering practices, crosscutting concepts, and disciplinary core ideas to make sense of phenomena. Three-dimensional learning leads to the development of a deep, useable understanding of big ideas that students can apply to explain phenomena and solve real-life problems. While the "Framework" describes the theoretical basis of 3D learning, and NGSS outlines possible theoretical learning progressions for the three dimensions across grades, we currently have very limited empirical evidence to show that a learning progression for 3D learning can be developed and validated in practice. In this paper, we demonstrate the feasibility of developing a 3D learning progression (3D LP) supported by qualitative and quantitative validity evidence. We first present a hypothetical 3D LP aligned to a previously designed NGSS-based curriculum. We further present multiple sources of validity evidence for the hypothetical 3D LP, including interview analysis and item response theory (IRT) analysis to show validity evidence for the 3D LP. Finally, we demonstrate the feasibility of using the assessment tool designed to probe levels of the 3D LP for assigning 3D LP levels to individual student answers, which is essential for the practical applicability of any LP. This work demonstrates the usefulness of validated 3D LP for organizing the learning process in the NGSS classroom, which is essential for the successful implementation of NGSS.

Computing fields are foundational to most STEM disciplines and the only STEM discipline to show a consistent decline in women's representation since 1990, making it an important field for STEM educators to study. The explanation for the underrepresentation of women and girls in computing is twofold: a sense that they do not fit within the stereotypes associated with computing and a lack of access to computer games and technologies beginning at an early age (Richard, 2016). Informal coding education programs are uniquely situated to counter these hurdles because they can offer additional resources and time for engagement in specially designed activities developed around best practices to improve girls coding identities (National Research Council [NRC], 2009). We draw upon research by Calabrese Barton et al. (2013) and Carlone and Johnson's (2007) research as a lens by which to examine girls' coding identity work in an informal coding education setting--a concept not currently defined in the science education research literature. In this paper, we describe the coding identity trajectories of three middle school girls who participated in a coding camp: Lilly, Victoria, and Beth. Our results provide a conceptual framework that will guide future research on coding identity that better encompasses the role of recognition by educators and peers on youth's coding identity development. This framework can be used to guide broader science education identity research, particularly as it applies to informal STEM education settings that work to engage students, especially girls, across the STEM spectrum.

Recent consensus documents in science education (e.g., the Next Generation Science Standards) emphasize helping students develop facility with constructing and critiquing both claims and the evidence that supports them. While students typically view evidence as necessary for supporting scientific claims, they tend to "objectify" evidence, that is, they see it as self-evident and factual, rather than as constructed or open to interpretation (Driver, Leach, Miller, & Scott, 1996; Sandoval & Çam, 2011). In this paper, I introduce a perspective from the science studies literature--evidence construction as transformation--that might usefully guide closer analyses of students' work with evidence. I describe the problem of objectification of evidence and how it has been studied, developing an argument for studying in greater detail how evidence is constructed by classroom communities over the course of their work with investigations. The remainder of the paper shows how one framework was developed for this purpose and describes how it was applied to an empirical investigation conducted in a third grade classroom to understand what work was done to construct evidence and what roles teachers and students were playing in this work. I argue that this framework makes visible three important aspects of evidence construction: what epistemic work is done to construct evidence, whom this work is meaningful to, and what it is meaningful for. I end the paper by exploring potential implications for understanding the construction of an explanation in community activity, the development of students' facility with evidence construction, and the teacher's role in facilitating the construction of evidence.

This study reports on an innovative version of adaptive primary literature (APL) that we call Science Behind the Scenes used during a summer professional development (PD) program. Classroom teachers read and discussed papers from the primary literature, and created translations of these papers relevant to their own classroom needs. We randomly selected 31 teacher-created Science behind the Scenes products for evaluation with a rubric that was aligned with the K-12 Science Education Frameworks (2012). In addition, we interviewed groups of teachers at follow-up sessions and individual teachers who used the APL in their classrooms. We used frameworks for grounded theory to sort the interview text and descriptive statistical measures for quantitative data. Our analysis reveals two key findings: (i) the teachers created respectable adaptations of primary scientific literature into APL; and (ii) the teachers used the APL products in their classrooms to support the discourse of science and disciplinary literacy, and to create a bridge to the scientific enterprise. Our findings have implications for instructional design, curricular materials, professional development, and science education.

Recent instructional reforms in science education bring a new vision that aims to move science teaching away from a focus on discrete facts covered at a superficial level to a focus on a smaller number of disciplinary core ideas that can be explored in depth. The success of these reforms depends on the instructional quality in science classrooms. Our goal in this paper is to introduce an instructional quality assessment tool that can provide a window into the extent to which students learn science through rigorous opportunities as envisioned in these reforms. We present the conceptual grounding of the tool and its development process with findings from a pilot test. Data collection involved in-class assignments, students' work, and video-records from nine science teachers' classrooms at a local school. The analysis revealed that the instructional quality assessment tool can reliably capture the variation in rigor in science classrooms. Specifically, the tool has the potential to assess elements of ambitious science teaching focusing on the rigor of tasks and talk that shape students' high-level thinking and sensemaking in science classrooms. The article concludes by discussing future directions for the further development of this tool and the ways in which it can be used for instructional improvement and teacher learning.

Learning progressions are theoretical models that describe learning of scientific ideas and practices over time. These hypothetical progressions need to be tested and refined in order to productively inform instruction and assessment. In this paper, we report our attempts to revise a learning progression in genetics. In particular, we focused on two constructs that embody core ideas in classical genetics and one molecular construct. The revisions are based on analysis of pre- and postinterview data obtained from sixty 11th grade students before and after they engaged in a 10-week unit that addressed these concepts. We found that while many of the students held ideas that aligned with the progression, there were several distinct dimensions of student reasoning that were not captured and led to substantial revisions of the constructs including: (a) the splitting of the construct dealing with meiosis (E) into two subconstructs (E1-physical passage of genetic information and E2 -- the role of sex cells), (b) the addition of new levels to constructs dealing with the universal nature and organization of the genetic code (A) and construct (F). For Construct A, the lower levels were expanded to include ideas about the localization of DNA in cells and to include ideas about the composition of DNA that were not captured in the progression. Revisions to Construct F included the expansion of existing levels and the addition of modes of inheritance such as codominance and incomplete dominance. The research we present offers insights about a methodological approach that can be used to test and refine progressions, as well as insights about student learning in genetics as we further describe and expand the stepping-stone ideas in the progression and discuss further the multidimensional nature of learning progressions.

The importance of science to the economy and for the progression of society is widely acknowledged. Yet, there are concerns that minority ethnic students in the UK are underrepresented, and even excluded, from post-compulsory science education and careers "in" science. Drawing on an exploratory study of 46 semi-structured interviews with British young people (aged 11-14) from Black Caribbean, Pakistani, Bangladeshi, Indian, and Chinese ethnic backgrounds, this paper explores why careers "in" science are not popular aspirations among minority ethnic students, while careers "from" science are highly sought after. Using sociological theories of identity, this paper argues that gender and ethnic identities can operate in multifaceted ways to influence students' careers aspirations. Being a scientist is constructed by students as a highly gendered and racialized profession, which may reflect popular discourse of scientist as typically for "white men." Careers "from" science, particularly in medicine, appeared popular among some, but not all, minority ethnic groups, as being a medical staff is considered intrinsically and extrinsically rewarding. Implications of the findings for the science education of minority ethnic students are discussed.

In this paper, I offer a critique of "A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas" (NRC, 2012) and of the "Next Generation Science Standards" (Achieve, 2013). While the new version of the science education standards and the arguments put forward to support them are an improvement from the previous version of the NRC Science Education Standards, we must pause and reflect on the implications on jumping on another education reform, fast moving train. Using sociotransformative constructivism as a guiding theoretical lens, I argued that the Conceptual Framework and NGSS documents fall short due to the lack of retrospection, the on-going contradictory discourses, and the lack of voice and representation in the development of these important policy documents. Suggestions for improvement and discussion are offered in hope that we might prevent the NGSS from having as little impact on teachers' practice and on students' learning as the previous version of the national science education standards had.

Recent documents pertaining to K-12 education have fostered a connection between engineering and science education to help better prepare our students and future citizens to better meet the current and future challenges of our modern and technological society. With that connection, there has been a concerted effort to raise the visibility of engineering within K-12 science education, which is reflected in the "Framework for K-12 Science Education" and the recently released "Next Generation Science Standards." As states look towards the adoption and implementation of the "Next Generation Science Standards," it is important to take a deeper look at the shift in K-12 science education that is being suggested by these documents and what that means in terms of the potential changes for states that have chosen to adopt these standards. The main research question that has guided the work for this paper is: What is the extent and quality of the engineering that is present in state science standards and the "Next Generation Science Standards"? This paper will present a detailed analysis of the landscape of engineering in K-12 policy before and after the release of the NGSS through a comparative case study of academic state science standards and "Next Generation Science Standards." This comparison provides insight into what the widespread adoption of the NGSS would mean in terms of potential changes in the way we implement science education in the United States.

Attention to core concepts in science and engineering in early education has grown recently, and understanding levers as force amplifiers can be recognized as one of these. Previous studies focused on two-sided levers and do not provide sufficient information about children's knowledge of levers as force amplifiers, nor about their learning and its support from an education perspective. It is important to consider load distance and force distance separately, as may be done in one-sided levers, to understand children's knowledge of levers as "simple machines" thoroughly. Moreover, children's zone of proximal development and the possibilities to foster their knowledge should be explored to understand important features of teaching. We thus directed two studies with 6- to 7-year-old children. In study 1, we conducted a paper-and-pencil test in the context of wheelbarrows (N = 370; age M = 6.62). We investigated whether it is possible to empirically separate the features load, load distance, and force distance as well as to determine their level of difficulty. Our study showed that children's concepts of the three aspects load, load distance, and force distance are fragmented, with children finding it continuously more difficult to judge load, load distance, and force distance correctly. In study 2, we developed a 20-min intervention with a controlled 2 × 2 pre-post follow-up design for exploring the zone of proximal development of 304 6- to 7-year-old children in the domain of one-sided levers as force amplifiers, focusing on force distance and load distance. We implemented a structured learning environment that encouraged the children to manipulate wheelbarrows and supported them with pictures and/or verbal prompts. 6- to 7-year-old children had a higher learning gain when they were exposed to scaffolds that combined pictures and verbal prompts in the posttest as well as in the follow-up test four weeks later compared to the control group.

This paper analyzes recent research conclusions regarding biology teacher attitudes toward evolution, and the variable implementation of evolution in the high schools nationwide. Berkman and Plutzer (2010. "Evolution, creationism, and the battle to control America's classrooms." New York: Cambridge University Press) conclude that due to a large portion of high school biology teachers compromising or downplaying evolution in the curriculum, the placement of evolution specific courses in biology teacher preparation programs will steer evolution deniers away from the field. In this paper, such arguments are situated in a larger historical and philosophical context of science education. By discussing recent sociological insight into the religiosity of education majors and education faculty, new questions are raised about student and teacher ontology, what this means for understanding science, the politics of science teacher education programs, and the epistemological and ethical limits of science education standards to dissolve Creationism.

Science education needs valid, authentic, and efficient assessments. Many typical science assessments primarily measure recall of isolated information. This paper reports on the validation of assessments that measure knowledge integration ability among middle school and high school students. The assessments were administered to 18,729 students in five states. Rasch analyses of the assessments demonstrated satisfactory item fit, item difficulty, test reliability, and person reliability. The study showed that, when appropriately designed, knowledge integration assessments can be balanced between validity and reliability, authenticity and generalizability, and instructional sensitivity and technical quality. Results also showed that, when paired with multiple-choice items and scored with an effective scoring rubric, constructed-response items can achieve high reliabilities. Analyses showed that English language learner status and computer use significantly impacted students' science knowledge integration abilities. Students who took the assessment online, which matched the format of content delivery, performed significantly better than students who took the paper-and-pencil version. Implications and future directions of research are noted, including refining curriculum materials to meet the needs of diverse students and expanding the range of topics measured by knowledge integration assessments. (Contains 11 tables and 5 figures.)

Biology instructors from middle school to university level recognize that natural selection is an essential topic in the curriculum. Numerous studies have shown the prevalence of many alternative conceptions about evolution that persist despite instruction in student populations all over the world. Having valid, reliable and easily used assessments is necessary for determining the effectiveness of instructional approaches. The recent article by Nehm and Schonfeld (2008) that compares the Conceptual Inventory of Natural Selection (CINS) with two other assessments finds that CINS is a useful tool for large groups of students, but also points to possible weaknesses of CINS and identifies some problematic issues with the original paper by the authors Anderson, Fisher, and Norman (2002). In this article, the authors respond to the criticisms of CINS construction, to CINS-related research, and finally offer their comment on potential usefulness of CINS with various populations. In summary, Nehm and Schonfeld raise some important issues that required explanation and, in some cases, rebuttal. Their discussion has posed interesting questions for future studies. The authors remain confident that CINS is a useful diagnostic tool for researchers, teachers, and professors.

Practices of generating, analyzing, and using evidence play a central role in the Framework for K-12 Science Education and the NGSS. However, the construct of evidence remains largely underspecified in these documents, providing insufficient guidance on how to engage students with the broad and complex nature of evidentiary reasoning. This creates a risk of perfunctory and simplified implementation of evidence-based practices that misses the intent of the standards and does little to prepare students for reasoning with the complex, varied, and contentious evidence encountered in popular media or in advanced education. To address these challenges, we propose a theoretical framework, which we call "Grasp of Evidence," that complexifies the concept of evidence in ways that facilitate introducing more authentic forms of evidence and more sophisticated ways of engaging with evidence in science classrooms. Our approach focuses on promoting a "lay" grasp of evidence needed by competent outsiders as they engage with science in their everyday lives. The framework posits five dimensions. The first four dimensions capture what students should understand about how experts work with evidence: evidence analysis, evidence evaluation, evidence interpretation, and evidence integration. The fifth dimension focuses on how laypeople can use evidence reports themselves. Each of these dimensions of practice involves specific epistemic aims, epistemic ideals, and reliable epistemic processes for reasoning with and about evidence. We discuss these dimensions and their contribution to the conceptualization of evidence as well as provide some initial instructional implications and potential directions for future research.

Part One of this paper summarizes six years of investigations devoted to the study of the influence that a variable called teacher "wait-time" has on development of language and logic in children taking part in elementary science programs. It discusses the relation of wait-time to 10 outcome variables. Wait time at two locations was studied in natural settings and in experimental settings to determine how location and duration of pauses influence the outcome variables. It was noted, in addition, that there is an interaction between wait-time and rewards and that students rated at the top or at the bottom of a class receive differential treatment with respect to these variables. A heuristic which relates wait-time and rewards to language, logic, and fate control is introduced. It will be discussed in more detail in Part Two of this paper. Part two, published in v58 n4 of this journal describes the relation between pauses, rewards, and fate control. (Contains 7 figures and 1 table.)

While opportunities for spontaneous, undesigned, serendipitous science engagement (SSE) are abundant and evidence regarding its affordances is accumulating, little is known about its nature. In this paper, I present a model defining and identifying SSE, which consists of a personal and a contextual continuum. To explore the nature of family SSE, I analyzed a 66-minute case, obtained through self-ethnography, of three children and a mother engaging with bugs they discovered in their backyard. Employing the "language games" approach, the analysis elucidates how the absence of designated goals enabled legitimate multiple language-games over relatively long periods of time, with one game supporting the other. It also reveals delayed uptake, in which children appear to ignore scientific practice or content, while they are actually picking up ideas that they later use to engage with science. Examining processes of guided participation reveals that it entailed authentic modeling and gradual participation in the sense-making game, without abandoning other games. I discuss implications for science learning and for learning theory more broadly, including parents' role in SSE, issues of time for and in SSE, and guided participation in academic activities lacking designated goals.